Question

Is it possible to make a standing wave from two longitudinal waves instead of transverse? Explain your reasoning, and then consider this: Sound is a longitudinal wave. If it’s possible to create a standing sound wave, describe how the sound would behave as you followed along the wave’s path. (e.g. Would it vary in strength and/or pitch? Would there be places along the wave where no sound occurs, or excessive sound?) In what situations would it be practical to create a standing sound wave?

Answer 1

Sound waves created in pipes closed at one end creates standing longitudinal waves.

There will not be any variation in pitch ( frequency )

At node of standing wave , there will not be any displacement . Since intensity of sound wave depends on displacement, at node sound intensity is zero.

Maximum sound occurs at antinode.

when length of tube = n $\lambda$ /4 standing sound wave occurs